.float-left {
  float: left;
}

.float-right {
  float: right;
}

.div-with-lines {
  position: fixed;
  height: 100vh;
  width: 100vw;
  background-size: cover;
  top: 0;
  left: 0;
  /* 取消线条 */
  /* background-image: linear-gradient(to bottom,
      transparent 1%,
      #ccc 5%,
      #ccc 1%,
      transparent 12%); */
  background-size: 100% 6px;
  padding: 10px;
}

.backgroundImg {
  position: fixed;
  height: 100vh;
  width: 100vw;
  background-size: cover;
  top: 0;
  left: 0;
  z-index: -1;
  text-align: center;
  background-position: center center;
}

.backgroundImg-text-div {
  display: flex;
  justify-content: center;
  /* 水平居中 */
  align-items: center;
  /* 垂直居中 */
  width: 100%;
  height: 100vh;
}

.backgroundImg-text {
  top: 300px;
  color: #000;
  font-size: 70px;
  font-family: "Courier New", Courier, monospace;
  font-weight: bolder;
  transition: 0.5s;
  cursor: pointer;
}

.backgroundImg-text:hover {
  transform: scale(1.5);
  background: linear-gradient(90deg,
      #000000,
      #ffffff);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  background-size: 200% 100%;
  animation: colorChange 3s linear infinite;
}

/* 定义动画效果 */
@keyframes colorChange {
  0% {
    background-position: 0%;
  }

  25% {
    background-position: 100%;
  }

  50% {
    background-position: 0%;
  }

  75% {
    background-position: -100%;
  }

  100% {
    background-position: 0%;
  }
}

.content {
  position: relative;
  margin-top: 96vh;
  display: flex;
  justify-content: center;
  height: auto;
  width: 100vw;
  left: -20px;
  bottom: -20px;
  background-size: cover;
  background-color: rgb(252, 252, 252);
  box-shadow: 4px 4px 4px rgba(0, 0, 0, 0.5), -1px -1px 2px rgba(0, 0, 0, 0.5);
}

.content-before {
  max-width: 1400px;
}


.content-center {
  display: flex;
  justify-content: center;
}